Added an HSE bypass option to the STM32 clock initialization.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@4157 35acf78f-673a-0410-8e92-d51de3d6d3f4

os/hal/platforms/STM32F1xx/hal_lld.c

@@ -215,6 +215,10 @@ void stm32_clock_init(void) {
     ;                                       /* Wait until HSI is the source.*/
 
 #if STM32_HSE_ENABLED
+#if defined(STM32_HSE_BYPASS)
+  /* HSE Bypass.*/
+  RCC->CR |= RCC_CR_HSEBYP;
+#endif
   /* HSE activation.*/
   RCC->CR |= RCC_CR_HSEON;
   while (!(RCC->CR & RCC_CR_HSERDY))

os/hal/platforms/STM32F2xx/hal_lld.c

@@ -149,6 +149,10 @@ void stm32_clock_init(void) {
     ;                           /* Waits until HSI is stable.               */
 
 #if STM32_HSE_ENABLED
+#if defined(STM32_HSE_BYPASS)
+  /* HSE Bypass.*/
+  RCC->CR |= RCC_CR_HSEBYP;
+#endif
   /* HSE activation.*/
   RCC->CR |= RCC_CR_HSEON;
   while ((RCC->CR & RCC_CR_HSERDY) == 0)

os/hal/platforms/STM32F4xx/hal_lld.c

@@ -151,6 +151,10 @@ void stm32_clock_init(void) {
     ;                           /* Waits until HSI is stable.               */
 
 #if STM32_HSE_ENABLED
+#if defined(STM32_HSE_BYPASS)
+  /* HSE Bypass.*/
+  RCC->CR |= RCC_CR_HSEBYP;
+#endif
   /* HSE activation.*/
   RCC->CR |= RCC_CR_HSEON;
   while ((RCC->CR & RCC_CR_HSERDY) == 0)

os/hal/platforms/STM32L1xx/hal_lld.c

@@ -165,6 +165,10 @@ void stm32_clock_init(void) {
 #endif
 
 #if STM32_HSE_ENABLED
+#if defined(STM32_HSE_BYPASS)
+  /* HSE Bypass.*/
+  RCC->CR |= RCC_CR_HSEBYP;
+#endif
   /* HSE activation.*/
   RCC->CR |= RCC_CR_HSEON;
   while ((RCC->CR & RCC_CR_HSERDY) == 0)

readme.txt

@@ -117,6 +117,9 @@
   3484947)(backported to 2.4.1).
 - FIX: Fixed various minor documentation errors (bug 3484942)(backported
   to 2.4.1).
+- NEW: Added HSE oscillator bypass capability to the STM32 clock
+  initialization, it is enabled by adding STM32_HSE_BYPASS to your
+  board.h file.
 - NEW: Updated the MSP port to work with the latest MSPGCC compiler (4.6.3
   LTS 20120406 unpatched), now the old MSPGCC 3.2.3 is no more supported
   (backported to 2.4.1).